One - you force your bird out of the cage, the only safety net it knows of
Two - you take the bird into a small room/tent that the bird is unfamiliar with
Three - the bird is in there with something (or rather, someone - a human) it fears
Does that sound like trust building to you?
Does the method work? Well, yes, it does... but at what cost to the bird? You force the bird to 'give up' so that it no longer tries to escape. It doesn't mean that your bird is no longer afraid, simply too exhausted to keep trying to get away.
This is what I wrote in your other thread....
Living With Parrots Cage Free: Bucky and Strider - Millet Eating Fiends!
I no longer keep budgies, but when I last had a flock of 5, I started the taming process simply be feeding them by hand first thing in the morning. After they finished eating that food, I replaced the left-overs in their dishes.
[ame="https://www.youtube.com/watch?v=fUx81WHTUwk"]1 Bird in hand Leads to Many - YouTube[/ame]
[ame="https://www.youtube.com/watch?v=AlSm4uFZzVU"]More Budgies!!!! - YouTube[/ame]
With birds that aren't comfortable with you putting your hand into their cage, it may help to start out by putting millet against the outside of the cage, near a perch that they use frequently, and don't look at them directly. They can then eat the millet as they become accustomed to you. It may take a few days though before they are ok with this.